Re: [loopantennas] Re: c-crane dual coil antenna?

Hi Kevin, If you will look in the files section I have several articles that I have posted that will give you a lot of information on multi-coil loop antennas,

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, Jul 5, 2013

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Hi Kevin,

If you will look in the files section I have several articles that I have
posted that will give you a lot of information on multi-coil loop antennas,
where I have made various configurations with 2 and 3 coils in parallel as
well as a Pollydoroff configuration. All of the various configurations, using
more that one coil have made an improvement in performance over that of a single
coil. Most of the experiments were done on either a Ferrite Sleeve Loop
(FSL), or on Sstacked Toroid Loop Sticks (STLS). You will find them listed under
my everettsharp74 email address. However, I do not use that address as my
primary address, it is everettsharp (at) aol.

I would much appreciate it if you would supply links to a
site or two where one can learn more about Xtal set builders use of multiple
air-wound coils in the same plane.

Thanks,

TomK4ZAD

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In loopantennas@yahoogroups.com,
kevin asato <kc6pob@...> wrote:>> It's similar to what
xtal radio developers have been using - multiple air-wound coils in the same
plane to help increase sensitivity to their crystal sets. The use of the
ferrite bar allows a reduction in the coil size. Difference is that the
crystal sets do not fix the position of the coils to allow for fine tuning of
signals. I do similar using a Terk Advantage coil with my portable radios. It
works but it is not a miracle worker.> > 73,>
kevin> kc6pob> > > >
________________________________> From: Don <stb55@...>>
To: loopantennas@yahoogroups.com> Sent: Thursday, July 4, 2013 5:03 AM> Subject: Re:
[loopantennas] c-crane dual coil antenna?> > > >
Â > Hi Steve,> > Thanks! I did not know you did
that investigation. I bought one a couple > of years ago to hopefully
improve the AM reception of my stereo in this > metal can. The
"twin-coil" was also about half price. Anyway, it did not >
help/improve reception in my case.> > Don KPC6NDB>
Upland, CA> 34.10 -117.63 1250ft> R-75 w/250Hz 2x R-71A w/250Hz
R-70> Perseus SDR-IQ FUNcube Dongle Pro+> FRG-100B DX-1000 SR-AF
& LPF> DSP599zx MFJ-784B HD-1418 AF-1> MSB-1 PA0RDT
Mini-Whip x2 @ 20ft> RYO Active Antenna @ 20ft> LFL1010 ALA100L
x2> > On 03-Jul-13 22:36, Steve Ratzlaff wrote:>
>> >> > This same topic came up several years ago. At
that time I bought the> > Twin Coil antenna and tore it apart and
tested it extensively on the> > bench. I used both the original twin
coil then replaced it with a single> > coil. In all tests, there was
no significant difference, if any> > differences at all, between the
two configurations. And reading the> > patent, there are glaring
errors seemingly purposely inserted to try to> > fool the unwary.
It's a good antenna for its 7.5" ferrite rod size and> > works well
and I recommend it if one needs a 7.5" ferrite rod remotely> >
tunable antenna. But if you homebrew your own using a similar 7.5" rod>
> from Amidon, and the standard single coil, you'll get the same>
> performance. There is no magic at all in the use of "twin coils".
If> > anything, it appeared the technician on the factory production
line> > could more easily and quickly adjust the antenna for the
proper tuning> > range, compared to a single coil--perhaps that's
the main reason why the> > "twin coil" continues to be made.>
> 73,> > Steve AA7U> >>

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